CC'ing you just in case....
Quoting Manx Translators (ubuntumanx@googlemail.com):
> Hello all,
> I would like to start a new translation for Manx (ISO code gv). If someone
> would care to point me in the right direction, and/or tell me what I need to
> do to get started, I'd be very grateful. I'd like to start by translating
> the debian installer.
Dy bannee diu, kys ta shiu!
http://d-i.alioth.debian.org/doc/i18n/ is probably what you want.
Correct me if I'm mistaken (and pardon my ignorance) but would
starting from another gaelic language translation (such as either
Irish or Welsh) make sense?